1 6c746070 2004-05-23 devnull #include <u.h>
 2 a46395ec 2003-10-01 devnull #include <signal.h>
 3 6c746070 2004-05-23 devnull #include <libc.h>
 4 a46395ec 2003-10-01 devnull 
 5 6c746070 2004-05-23 devnull #define DBG 0
 6 6c746070 2004-05-23 devnull 
 7 a46395ec 2003-10-01 devnull static void
 8 a46395ec 2003-10-01 devnull ign(int x)
 9 a46395ec 2003-10-01 devnull {
10 a46395ec 2003-10-01 devnull 	USED(x);
11 a46395ec 2003-10-01 devnull }
12 a46395ec 2003-10-01 devnull 
13 a46395ec 2003-10-01 devnull void /*__attribute__((constructor))*/
14 6c746070 2004-05-23 devnull ignusr1(int restart)
15 a46395ec 2003-10-01 devnull {
16 6c746070 2004-05-23 devnull 	struct sigaction sa;
17 6c746070 2004-05-23 devnull 
18 6c746070 2004-05-23 devnull 	memset(&sa, 0, sizeof sa);
19 6c746070 2004-05-23 devnull 	sa.sa_handler = ign;
20 6c746070 2004-05-23 devnull 	sigemptyset(&sa.sa_mask);
21 6c746070 2004-05-23 devnull 	sigaddset(&sa.sa_mask, SIGUSR1);
22 6c746070 2004-05-23 devnull 	if(restart)
23 6c746070 2004-05-23 devnull 		sa.sa_flags = SA_RESTART;
24 6c746070 2004-05-23 devnull 	sigaction(SIGUSR1, &sa, nil);
25 a46395ec 2003-10-01 devnull }
26 a46395ec 2003-10-01 devnull 
27 bcf527a9 2004-09-17 devnull void
28 bcf527a9 2004-09-17 devnull _procsleep(_Procrend *r)
29 a46395ec 2003-10-01 devnull {
30 bcf527a9 2004-09-17 devnull 	sigset_t mask;
31 a46395ec 2003-10-01 devnull 
32 bcf527a9 2004-09-17 devnull 	/*
33 bcf527a9 2004-09-17 devnull 	 * Go to sleep.
34 bcf527a9 2004-09-17 devnull 	 *
35 bcf527a9 2004-09-17 devnull 	 * Block USR1, set the handler to interrupt system calls,
36 bcf527a9 2004-09-17 devnull 	 * unlock the vouslock so our waker can wake us,
37 bcf527a9 2004-09-17 devnull 	 * and then suspend.
38 bcf527a9 2004-09-17 devnull 	 */
39 bcf527a9 2004-09-17 devnull 	r->asleep = 1;
40 bcf527a9 2004-09-17 devnull 	r->pid = getpid();
41 a46395ec 2003-10-01 devnull 
42 bcf527a9 2004-09-17 devnull 	sigprocmask(SIG_SETMASK, nil, &mask);
43 bcf527a9 2004-09-17 devnull 	sigaddset(&mask, SIGUSR1);
44 bcf527a9 2004-09-17 devnull 	sigprocmask(SIG_SETMASK, &mask, nil);
45 bcf527a9 2004-09-17 devnull 	ignusr1(0);
46 bcf527a9 2004-09-17 devnull 	unlock(r->l);
47 bcf527a9 2004-09-17 devnull 	sigdelset(&mask, SIGUSR1);
48 bcf527a9 2004-09-17 devnull 	sigsuspend(&mask);
49 a46395ec 2003-10-01 devnull 
50 bcf527a9 2004-09-17 devnull 	/*
51 bcf527a9 2004-09-17 devnull 	 * We're awake.  Make USR1 not interrupt system calls.
52 bcf527a9 2004-09-17 devnull 	 */
53 bcf527a9 2004-09-17 devnull 	ignusr1(1);
54 bcf527a9 2004-09-17 devnull 	assert(r->asleep == 0);
55 c6687d45 2004-09-21 devnull 	lock(r->l);
56 6c746070 2004-05-23 devnull }
57 6c746070 2004-05-23 devnull 
58 bcf527a9 2004-09-17 devnull void
59 bcf527a9 2004-09-17 devnull _procwakeup(_Procrend *r)
60 6c746070 2004-05-23 devnull {
61 bcf527a9 2004-09-17 devnull 	r->asleep = 0;
62 bcf527a9 2004-09-17 devnull 	assert(r->pid >= 1);
63 bcf527a9 2004-09-17 devnull 	kill(r->pid, SIGUSR1);
64 a46395ec 2003-10-01 devnull }